* Modify get_kf_testing_cluster.py so we can output to a YAML file
  information about the cluster that we matched against.

  * This is necessary to allow getting information such as the name of
    the deployment in subsequent steps/tasks.

* Refactor get_kf_testing_cluster.py so we can start using the python Fire
  module to create CLI entrypoints as opposed to using argparse.

  * Provide backwards compatibility with argpase

Related to: GoogleCloudPlatform/kubeflow-distribution#4 endpoint ready test is failing